Deployer connect to Broker fails on 9.5 SP1


I currently try to connect my Deployer to my Brokers to perform a deletion of outdated document typs and clients.

Unfortunately the connection from Deployer to Broker is not working.

Deployer 9.5 SP1 with Fix8
Broker 9.5 SP1 with Core Fix 15 and Java API Fix 7

Broker is using SSL with encryption enabled, but I cannot see an option to enable encryption in the Deployer connection config.

Any ideas whats going wrong?